Nikki Sixx is an American musician, best known as the co-founder, bassist, and primary songwriter of the heavy metal band Mötley Crüe, being the only member to remain throughout their entire history. Prior to forming Mötley Crüe, Sixx was a member of Sister before going on to form London with his Sister bandmate Lizzie Grey. In 2000, he formed side project group 58 with Dave Darling, Steve Gibb and Bucket Baker, issuing one album, Diet for a New America. Also in 2002, he formed the hard rock supergroup Brides of Destruction with L.A. Guns guitarist Tracii Guns. Formed in 2006, initially to record an audio accompaniment to Sixx's autobiography The Heroin Diaries: A Year in the Life of a Shattered Rock Star, his side band Sixx:A.M. featured songwriter, producer, and vocalist James Michael and guitarist DJ Ashba.

Mötley Crüe is an American heavy metal band formed in Hollywood, California in 1981 by bassist Nikki Sixx and drummer Tommy Lee with guitarist Mick Mars and lead vocalist Vince Neil joining right after. The band has sold over 100 million albums worldwide. They have also achieved seven platinum or multi-platinum certifications, nine Top 10 albums on the Billboard 200 chart, twenty-two Top 40 mainstream rock hits, and six Top 20 pop singles.